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Incorporates the ARM7TDMI® ARM® Thumb® Processor . Atmel’s AT91SAM7X/ is a member of a series of highly integrated Flash. Development Board for the Atmel AT91SAM7X Microcontroller trademarks or trademarks of ARM Ltd. I2C™ is a trademark of Koninklijke. Microchip AT91SAM7X ARM Microcontrollers – MCU are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for Microchip.

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Atmel AT91SAM7X

Thread aware file system Hint: See the Embedded Ethernet Examples List page for more information. This demo – Consists entirely of open source software. Demonstrates the creation of dynamic data with a simple CGI scripting language written by Adam Dunkels.

Creates 31 of the standard demo tasks in addition to the web server task and the idle task. Users must familiarise themselves with the uIP license.

If this project fails to build then it is likely the version of IAR Embedded Workbench being used is too old. If this is the case, then it is also likely that the project file has been silently corrupted and will need to be restored to its original state before it can be built even with an updated IAR version.

See the Source Code Organization section for a description of the downloaded files and information on creating a new project. The prototyping board should also allow the use of a standard Ethernet cable when connecting point to point, but I have not tested this configuration.

The IP addresses used by the web browser computer and the prototyping board must be compatible. This can be ensured by making the first three octets of both IP addresses identical. For example, if the web browser computer uses IP address You must ensure that the configured MAC at91sam7x2556 is unique on the network to which the prototyping board is being connected. This must be set appropriately for your hardware. The demo application uses the LEDs built into the prototyping board so no other hardware setup is required.


Atmel AT91SAM7X (ARM) Board, Color LCD, USB, 2x

Building the demo application for debug Two project configurations are provided. Simply open the rtosdemo. Selecting the flash debug configuration Running the demo application The IAR port cannot be executed using the IAR simulator so must be executed on the target hardware.

Ensure an Ethernet cable is connected as described above. The embedded microcontroller Flash memory will automatically get programmed with the demo application, and the debugger will break at the reset vector address 0.

Functionality The demo application creates 33 tasks – consisting predominantly of the standard demo application tasks see the demo application section for details of the individual tasks. In addition there is a uIP task that implements the embedded web server, a ‘Check’ task and the idle task. When executing correctly the demo application will behave as follows: The target hardware will serve web pages to a standard web browser.

To connect to the target: Open a web browser on the connected computer. Not all the tasks update an LED so have no visible indication that they are operating correctly. Therefore a ‘Check’ task is created whose job it is to ensure that no errors have been detected in any of the other tasks. Every three seconds the ‘Check’ task examines all the tasks in the system to ensure they are executing without error. The toggle rate increasing to ms indicates that the ‘Check’ task has discovered at least one error.

The perl script requires Linux or, as I use, a Cygwin shell. See the uIP documentation for further information. This table at91sam7256 interesting for demonstration purposes, but as it is necessary to leave interrupts disabled for an extended period during its creation it is not recommended for use in applications with strict real time requirements.

Atmel AT91SAM7X256

The interaction is further simplified by the single buffer memory management of uIP. The lwIP stack implements a more flexible complex memory management scheme, therefore the lwIP demo application contains a more comprehensive EMAC driver. When a buffer is available for processing an EMAC interrupt is generated. All the interrupt service routine does is signal to the uIP task via a semaphore that data is available for processing.


The semaphore immediately unblocks the uIP task, which processes the data and if necessary generates a response. The uIP task blocks on the semaphore with a timeout. Each receive buffer is bytes. The size of each transmit buffer is equal to the uIP buffer size. The driver included in the download uses the EMAC in its most basic configuration. This is in contrast to the lwIP demo, where mutual exclusion is explicitly handled by use of a semaphore at the network interface level.

Performance The uIP stack only ram one packet to be unacknowledged at any one time. It waits for each packet to be acknowledged individually. Performance is therefore greatly improved by transmitting dynamically generated data as one large packet, rather than multiple small packets.

This is demonstrated by the sample CGI scripts included in the source code download. The CGI script used to generate the table of tasks transmits the entire table in one packet and therefore loads quickly.

Please refer to the SAM7S demo documentation for more detailed information. The demo applications included in the FreeRTOS download switch to supervisor mode prior to main being called. If you are not using one of these demo application projects then ensure Supervisor mode is entered before calling vTaskStartScheduler. See the Demo Application Hardware Setup notes above. Selecting the flash debug configuration.

Entering the IP address at1sam7x256 the web browser obviously use the correct IP address for your system. Fail Safe File System: Delivered online or on-site.

Thread aware file system. Use the tree menu to navigate groups of related pages.